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Statement of a problem № 4020

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A beam of parallel rays is incident at an angle of 30° with the normal on a plane-paralleled film of thickness 4x10^(-5) cm and refractive index 1.50. Show that the reflected light whose wavelength is 7542 A will reinforce.

Solution:
A beam of parallel rays is incident at an angle of 30°  with the normal on a pl

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